Delay Problem Adding a document to existing index

[sunildm4u]

Hi

   I am new to lucene..In my project we are implementing serch engine
through lucene.we have lacs of records.The problem is

Once if i index 50000 records its takes approximation 20 min. Now thnk i
want to add  5 more records to database. if  i use

     IndexWriter indexWriter = new IndexWriter(getFilePath(),
getAnalyzer(),false)

Then also its creating all the index from sctratch.. which again takes 20
min for  extra 5 records.. Its not affordable does any one has a 

solution for this.. i am sending the code for your reference

IndexWriter indexWriter = new IndexWriter(getFilePath(),
getAnalyzer(),false);

while (resultSet.next()) {

Document document = new Document();     
                 
                document.add(new Field("Surname",
resultSet.getString("NAME_1"),Field.Store.YES,Field.Index.TOKENIZED));
        
                indexWriter.addDocument(document);

                count= count+1;
        
        System.out.println("indexed :" + count + " " +
resultSet.getString("NAME_1"));

          }
        
        indexWriter.optimize();
        
        indexWriter.close();
 
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